Protection level IP54, IP is the mark, number 5 is the first marking number, 4 is the second marking number, the first marking number means the contact potection level, the second mark number means the water proof level, contact protection and anti external force (first number) water-proof level(second number).

First number protection area

Second number protection area

Name description:

0 no protection

1 protection from 50mm diameter and big thing. Diameter 50mm. No damage from the vertical dropping water

2 protection from 12.5mm diameter and big external thing. Diameter 12.5mm. No damage from the dropping water for an angle of 15 degree. No damage from the vertical droping water.

3 protection from 2.55mm diameter and big external thing. Diameter 2.5mm. No damage from the dropping water with angle 60 degree.

4 protection from 1.0mm diameter and big external thing. Diameter 1.0mm. No damage from the dropping water with any angle

5 Anti dust, impossible complete anti dust. But no damage to the equipment.

6 Anti dust, with an air compress of 20mpa, no dust can enter the cabinet. water pull from every angle can not cause any damage. No enter of the detector into the cabinet. Short time water proof when drank in the water.

8 Protection long time water drank. Water drank under certain condition. The volumn should not exceed a certain quantity which can cause a damage.

Techniqul article:

water proof test

1. area

Water proof test should include the second digit from 1 to 8, which protection level is 1P x 1 to IP x 8

Sample mounting: put one side of a cabinet to be 15 degree vertically. The distance between the water dropping position and sample top should not exceed 200mm. Change one side after finished one side. Totally 4 times.

2015年3月11日星期三

1) What is the minimum watching distance and then decide the size of the display according to the actual space.

2) Pixel pitch and resolution

3) The space for installation and maintainence

4) The angle from the display to the ground

What content do you want to show?

1) TEXT. Based on the size of the text and the resolution need.

2) Normal video. 320 x 240 dot matrix

3) Number standard DVD display: ≥640 x 480 dot matrix

4) Complete computer video: ≥800 x 600 dot matrix

What are the requirements for the led display brightness according to the Environmental brightness?

General requirement for the brightness are as follows:

1) Indoor:>800CD/M2

2) Semi outdoor: >2000CD/M2

3) Outdoor( facing North):>4000 CD/M2

4) Outdoor( facing south):>8000CD/M2

Requirement for the brightness of RED, GREEN and BLUE when show white.

RED, GREEN, BULE plays different role when showing white. The fundamental reason is due to the human eye retina视网膜 has different feeling for different wavelengths of light. After a large number of experiments and test, we come to the following ratio for the reference: Simple red-green-blue light ratio: RGB 3:6:1 accurate brightness ratio: 3.0:5.9:1.1

In the production of the led screen, we should use the trichromatic LED lamp with high lunimous efficiency and rich color. So that in the chromaticity染色性 diagram of color in the triangle area and near the tongue as far as possible in the color spectrum curve, to meet the needs of rich color and the issue of sufficient brightness and the tongue-shaped curve for the 515nm wavelength of light best, so high-end LED screen selected wavelength close to 515nm pure green LED light pipes, such as the choice of 520nm, 525nm or 530nm wavelength LED light tube.

When you know the brightness and the resolution, how to calculate the brightness of a single led?

Caculate as follows: (2R1G1B)

Red LED brightness: brightness(CD)/ M2/dots/M2 x 0.3/2

Green LED brightness: brightness(CD)/M2/dots/M2 x 0.6

Blue LED brightness: brightness(CD)/M2/dots/M2 x 0.1

E.G : 2500dots/sqm, 2R1G1B, brightness per sqm is 5000 CD/M2

so red led brightness is as follows: 5000/2500 x 0.3/2=0.3

green LED brightness :5000/2500 x 0.6/2=1.2

blue led brightness:5000/2500 x 0.1=0.2

brightness of a single pixle :0.3 x 2+1.2+0.2=2.0 CD

Why choose DVI graphics card standard interface?

1) DVI graphics card interface is in line with international standards for the computer interface

2) No need to open the chassis, can be easily installed;

3) High-memory and strong dynamic screen display capability

4) Good compatibility of hardware and software

5) Supports all operating systems and application software

6) High-volume production, low cost, easy maintenance.

Can the display be controlled with Laptop?

no, Laptop's graphics card is built-in, there is no DVI port, can not be achieved in connection with the control system.

What are the differences of nichia chip and othe domestic led chip except price?

1) Chip: Nichia company produce their chip independedtly while the domestic company always use the chips from America or Taiwan.

2) Packaging: Nichia company packaging independently, no branch factory in China.But for the domestic chip, there are many factories do the packaging.

3) Consistency: for the Nichia led in one lot, the wavelength has little difference, But for the domestic led, consistency is relatively poor

4) Life span: Nichia led has relatively longer life span, Domestic led attenuate faster.

indoor full color LED dot matrix display and SMD full color display, What is the difference?

3) maintenance: full-color module is not easy to maintain. The cost of replacing the entire module is high; the SMD full-color module is easy to maintain, maintenance can be carried out by replacing a single lamp;

Can the SMD used for outdoor display? Why?

No. Outdoor screen has high demand of installation and structure, SMD LED unable to adapt to the harsh outdoor environment; at present SMD display can not to meet brightness requirements of outdoor display

Yes now.

Why it takes longer time to produce outdoor display ?

1) procurement of raw materials: purchasing the led takes long time, specially when you have to import , it takes even longer time.

when design the size of the display, there are 3 factors very important.

1) the needs of displaying content

2) space limitation

3) according to the module size and resolution

More than 10 kilowatts buck should start screen equipment.

Communication requirements: communication distance is long for the definition of communication.

To be installed to display the type of communication lines used by the length of the standard to install communications lines.

The prohibition of communication lines and power lines in the same pipe line alignment.

Installation requirements: about the level of the installation screen does not allow backward - to the installation of lifting up and down adjustment rod - wall to be installed before installing forward off hook - landing position to increase support for the installation of bolts.

Indicators display power consumption and power requirements of what?

Screen is divided into the average power consumption of the power consumption and maximum power consumption. Also known as the work of the average power consumption is usually the actual power consumption. Power consumption is the largest start-or full-bright at the time of extreme circumstances, such as power consumption, maximum power is AC power supply (wire, switches, etc.) must take into account the elements. Average power consumption is generally the largest power of 1/3. Display is a large-scale precision electronic equipment, safe use and reliable to work, its power supply input AC220V or AC220V power supply connected to the computer?ˉs input must be grounded. Note: The computer?ˉs power supply input AC220V grounding terminal connected with the computer chassis.

Display of the installation requirements?

Power requirements: power supply wiring should be in the body size of the screen 220V electricity power supply, FireWire grounding line 0 line; 380V electricity supply, the three 10-line ground line of fire line; the front lines with the 0-line the same wire cross-sectional area; more than 10 kilowatts buck should start screen equipment. Communication requirements: communication distance is long for the definition of communication. Installed to display the type of communication lines used by the length of the standard to install communications lines. Prohibition of communication lines and power lines in the same pipe line alignment. Installation requirements: about the level of the installation screen, do not allow the dumping after the lifting rod to regulate the installation of up and down before the installation of wall mounted hook falling forward landing position to increase support for the installation of bolts.

What issues should be considered for outdoor screen design and installation ?

The main issues of outdoor screens are as follows:

1) Screen installed in the outdoor sun and rain often, the wind dust cover, the work environment. Electronic equipment to be wet or damp can cause serious short-circuit or even fire, and even lead to failure of fire, resulting in losses;

2) Screen may be caused by strong electric lightning attack Magnetic;

3) Significant changes in ambient temperature. Display the work itself should have a certain amount of heat, if the ambient temperature and the heat is too high and non-performing, integrated circuits may not work correctly, and even burned down, so that shows that the system does not work;

4) Wide audience, require line-of-sight distance requirements of wide field of vision; ambient light changes, in particular, may be subject to direct sunlight.

The special requirements of the above, outdoor display must be:

1) Screen body and the screen body and architecture must be strictly waterproof junction leakage; screen body in order to provide good drainage measures, in the event of a smooth water emissions; (2) and building on the screen to install lightning protection devices. The main screen and the casing to maintain a good grounding, grounding resistance is less than 3 ohms, so that high current caused by lightning discharge in time;

3) The installation of ventilation to cool the screen so that the internal body temperature of -10 ℃ ~ 40 ℃ between. Screen behind the body above the axial fan is installed, from the heat;

4) Choice of working temperature -40 ℃ ~ 80 ℃ industrial level integrated circuit chip, the temperature is too low to prevent the winter so that the screen could not be activated. ;

5) In order to ensure a strong ambient light in the case of remote visualization, we must choose ultra-high brightness light-emitting diodes;

6) Shows that the new optional wide angle medium tube, wide angle, color pure, consistent coordination, more than 100,000 hours life. Show that the outer packaging for the media the most popular along with over a square cylinder, silicone sealed, non-metal assembly; its refined aesthetic appearance, sturdiness and durability, with the anti-direct sunlight, dust-proof, waterproof, anti-high temperature, anti-short-circuit the "Five Anti" feature.

2015年3月8日星期日

Like many traditional Electronic products, LED display screen not only need us pay attention to the way of use the process of using , but also need us to know the maintenance the LED display .Through that,it useing life will be longer .Here are ten ways of how to maintenance the LED display .

Keeping the full color LED display of humidity use environment,do not let any have moisture things go into it.If we let the humidity full color LED display in electric,it will cause the corrosion of full-color display components, and cause permanent damage.

2The most closely to our user is full color LED display screen. It is very necessary to do well the maintenance work.If the display prolonged exposure in outdoor environment having wind, sun,dust ,it will easily to dirty. After a long time,there are certainly dust on the screen ,which need to be cleaned timely to prevent dust long time parcel surface to influence the watching effect.

3To avoid meet some problem, we can combine the passive protection with active protection,and try to keep away from the items that will caused some damage to display screen .When you clean the screen ,please gently wipe as much as possible,to minimize the possibility of injury to the LED display .

4Advising the rest time of led electronic display is above two hours every day.In the rainy season,the large LED display screen at least rest one week or more than once. At least turn on the screen once on a month,light up more than 2 hours

At previous chapter ,we have already talk about four ways to maintenance LED display panel. In this article, we will continue to talk about this topic.

5:It require the stability power supply , and having good grounding protection, do not use it in bad weather conditions especially in the thunder weather.

6 Do not let the conductive metal such as water and iron powder go into the LED display cabinet. Please use the LED display screen in a low dust environment, because the big dust will not only influence the display effect but also be harmful to the circuit. If have water went into the outdoor led display or others types products due to various reasons，please turn off it timely and keep in touch with the maintenance staff, until the screen display board dry it can use .

7 Please pay attention to the switching sequence of LED display .

A: Turn on the control computer and then open it to the normal operation of large LED display.

B: Turn off LED display, then turn off the computer.

8 Do not let the LED display in the all-white, all red, all green, all blue and other bright screen for a long time ,to avoid excessive current, power cord excessive heating, LED light damage, then affect the using life of LED display .Do not disassemble,stitching screen .

9 You can use alcohol to wipe the surface of LED display , or use the brush, cleaner for dust. Do not use the damp cloth direct to wipe it .

10 LED display screen need to check it whether it can be working normally ,check the LED display module for damage, and maintenance or replace the damaged module .The non-professionals are prohibited to touch the line in LED display cabinet , in order to avoid electric shock,or caused damage to the line. If a problem occurred,please let the expert to repair it

Pixels Uncontrolled Rate in LED Display Screen

In this article, we'd like to talk about pixels uncontrolled rate in LED display screen. It refers to the proportion of minimum image display unit (pixel) uncontrolled .

There are two types of it :

one is in need of light when it is not bright, called blind spot ;another type is in need of not bright when it always having bright , it called often highlights. Usually , the composition of pixels is 2R1G1B（two red、 one green and one blue light , the following statement is in same reason) 、1R1G1B、2R1G、3R6G etc. Uncontrolled generally is not the red 、green and blue light in one pixel are all out of controlled, but if only one of the lights is out of controlled , we think that the pixel is out of control. For simplicity , we statistics and calculate the uncontrolled pixel is according to each color LED display (i.e. red, green, blue) ,then we regard the maximum value as the display pixels out of control.

The proportion of display pixels out of control in the total number of pixels in the full screen is called "full-screen pixel control rate." of led electronic display. In addition , in order to avoid runaway pixel concentrated in a certain area , we put forward the "regional pixel control rate", that is to say in the 100X100 pixel area , the number of uncontrolled pixels and the regional total number of pixels (ie 10000) ratio. as for ” the uncontrolled pixels is discrete distribution” in "LED display general specification" SJ/T11141-2003, this index requirements were quantified , convenient and intuitive.

At present, the LED display in domestic would be aging (baking machine) before they send out to factory , they will maintenance and replace the uncontrolled LED light , it is no problem that the “full-screen pixel control rate” is controlled within 1/104 and the "regional pixel control rate" is within 3/104 .And even some led display manufacturers are not allowed having out of control pixels before the factory, but it will increase the manufacturing maintenance costs and extend the delivery time . In different applications, the actual requirements of pixels out of control is big difference .In general , if the LED display is used to show the video, the index control in 1 / 104 is acceptable and also can be achieved, but if it is only used to show the simple characters information , the index control in 12/104 is reasonable.

How to Choose the Specifications of Full Color LED Display?

1 If the environment is different, the corresponding waterproof requirements are not the same, and it depends on the position of LED display is outdoor, semi-outdoor or indoor. Waterproof requirement of the outdoor led display is high, generally above IP65. According to in what kind of environment, we can know the general choose range is outdoor full color display, semi-outdoor full color display, or indoor full color display.

2The viewing distance is very important; it directly determines which kind of LED display model you will purchase. Generally speaking, the generally module of indoor full color LED display is P6, P7.62, P10, p12 etc; while the outdoor full color LED display is P10,P12,P16,P20 etc . These are conventional, but also such as pixel screen, curtain screen, the special specification model without the same screen. The figures behind the conventional P are the distance between lamp beads, in millimeters. In general, the minimum distance of our visual is equivalent to the size of P behind the figures. The best spacing of P10 is 10 m; this method is only use as approximate estimates.

Another scientific method is that calculated the density of lamp in per square .For example, the point density of P10 is 10000 points / square, the best distance is equal to 1400 divided by (the square root of the density of points). P10 is 1400/10000= 1400/100 = 14 open square meters, so the best observation of P10 screen is 14 meter away.

The above two methods are directly determines the full color LED display model .Pay attention to the following two points when you are choosing:

1 environment of the LED display.

2 the distance from the best observation position to the screen. Only by understanding these, you can choose to match with your environment, and achieve the best results of the full color LED display.

Special Considerations of Outdoor LED Display Screen

The outdoor LED display mainly has the following problems:

owing to the display screen is installed in the outdoor environment as advertising signs etc,will often exposure in the sun,splashed wet in the rainy day, suffer the wind blowing and dust covered, it working in the bad condition. If the electronic equipment is become seriously wet or damp, it can cause short-circuit or even catch fire, causing fault or fire, lead to the losses. LED display may suffer the attacks of strong electric and strong magnetic which due to the thunder.

The working environment temperature of led display is change greatly. When the display is at working ,it always send out a certain amount of heat ,if the environment temperature too high and the heat not dissipate smoothly, it will cause the integrated circuit may not work properly, or even burned down, so that the display system cannot work normally.

In view of the above special requirements, outdoor LED screen must be done:

1: The screen and the screen body and architecture combine department must be strictly waterproof leak. The screen body must have good drainage; if occurred water accumulation, the water can smoothly discharge.

2: The display and the building must install the lightning protection device.

3: The shell and the main body of led outdoor display maintains good grounding, grounding resistance less than 3 ohm, so the large current caused by lightning can discharge timely.

4:In order to reduce the temperature, it need to installed the ventilation system, so that can control the temperature of the led display body is between -10℃ and 40℃.

6:In order to ensure the viewing effect in the bright environment of the led display under long-range , high brightness light emitting diodes must be selected.

7:Selection of working temperature between -40℃ and 80℃ industrial integrated circuit chip, prevent the winter temperature is too low so that the screen cannot start.

As a company must pay attention to the LED display technology: Pixel Correction

Attenuation of the LED itself, will affect the LED display of the "life", then the cost considerations, the correct display of how to improve the life of it?

LED display is composed of a number of LED's, and even the same batch of LED, brightness and wavelength dispersion is also large, which leads to inconsistent display (Huaping) problem. If different batches of the LED to be used in combination, then the display will be more consistency is poor, "the video, dirty screen" phenomenon will be more serious, serious impact on viewing. So far only point by point correction technique can improve the consistency of the entire screen display, lifelike color reproduction level, and a mature point of correction can be achieved by different batches of LED production mix, and ensure consistency of the entire screen display good color reproduction more realistic. Point by point correction technology also enables a large screen display in the viewing field to select the appropriate locations on-site calibration, to ensure that the display position in the field to watch the high degree of consistency. This feature can provide customers with value-added services that display in the use of relatively long period of time (one year) after the decay of the inconsistency led to the LED display "Huaping" phenomenon, in the field of display can be provided to customers point by point calibration services, greatly improved screen display, like the new screen-like.

LED display technology becomes increasingly sophisticated, point by point correction technique in which the rise of technology in recent years, one of the industry will become a must-have technology. In the course of the LED light will be bad, install the application on the screen, the screen uniformity will decrease. Therefore, on-site re-calibration technology LED display manufacturers should become another important technique to master. Dakco Industrial Holdings Ltd. Will constantly strive for the early R & D to fully grasp these two important technologies to provide customers with better products and services.

Industry on the development prospects of LED display

LED display seems to have entered a season, LED display showing how future development will be a trend yet. Many in the industry for the future development of LED display some analysis, if so, you can based on the actual LED display dealer situation, refer to the following.

Large amounts of capital into the LED industry, on the one hand quickly down the costs for the industry, it also exposed the many problems of disorderly competition. Once the core technology, insufficient manpower shortage and other sectors can not be improved, LED industry is still subject to the shortest of the short board, and can not achieve the desired capacity.

Throughout the crisis facing overcapacity in this year's LED industry has periodically invested state of serious overheating. In this case, there is a voice of industry, LED how to deal with excess capacity? Evidently, a lot of LED lighting companies have mastered the current low-power chip technology, and high-power LED lighting on the epitaxial material demanding, in this context, the Chinese companies in the LED in order to capture a slice of the upstream industry chain is extremely difficult, and only a small part of the business can survive in the cracks. Insiders pointed out, LED market access threshold is low, the initial investment of 100 million plant can make LED projects have been started all over, and many had never set foot in the LED industry, companies have also joined them.

According to expert analysis, LED explosive situation seems a bit with the previous polysilicon LCD panels and similar. From the current and planned construction projects statistics show, LED production capacity of at least 3-5 borrowing against future market demand. After the completion of a large number of LED projects will highlight the LED industry is not concentrated, excess capacity, market disorderly competition and lack of skills and other thorny issues.

The worry is that while investment in Redu high, but the market is not optimistic. This year the price of the sapphire substrate has been declining. According to related statistics show that from January to July this year, 2-inch sapphire substrate prices from the beginning up to $ 35 / piece, down to the current $ 13 / piece -15 USD / piece, the average fell by more than 50%.

It should be pointed out that the upper reaches of the excess capacity will inevitably lead to the LED chip prices, while the LED chip in the product the higher the proportion of total cost, so that the end product is likely to further price cuts.

If you can bring the market price is also something that is not a universal way, but the problem is also reflected in the technology. LED tube lamp than the average price is indeed high, but not a major problem. Many small and medium enterprises in the production of LED lamps do not pass the quality and technology, often necrosis. Companies need to devote more efforts in the application of technology, rather than to invest in the upstream.

The Definition of LED Display

LED is the English abbreviation of light-emitting diode (Light Emitting Diode ) . Light Emitting Diode is a electronic apparatus, it can convert the electrical energy into light energy electronic and having the diode characteristics. The Internal structure of light emitting diode is a PN junction. When the electrons and caves in the light emitting diode are composited, the electronic transition from the high energy level to a low energy level, the electronic release the excess energy in the way of emission of photons (electromagnetic wave), to produce the electroluminescence phenomenon

LED luminous color and luminous efficiency are related to production of LED materials and processes. At present, the red, green, and blue are widely used .

Since LED low voltage (only 1.5-3V), it can take the initiative to lightness and have certain brightness ,the brightness can used for voltage (or current) regulation , which itself has impact resistance ,vibration resistance, long life (100,000 hours), so in large display device, there is no other display way can compared with LED display screen.

LED display is a display device that composed of the arranged light-emitting diodes. It uses low-voltage scanning driver ,has the advantage of long service life , low cost, high brightness, small fault , large viewing angle ,far viewing distance , color and pattern changes rich , dynamic real-time response speed, etc. LED display screen adopts modular in design, display area is according to the size of any unit module arbitrarily splicing.

led electronic display can be used to display a wide variety of propagate messages, which can be used to display text, graphics, images, animations, quotes, video, video signals .it has large information content and also has many display ways ,such as text, graphics, images, animation and video .LED display with its perfect mu

2015年3月4日星期三

1, scope this criterion specifys the LED display the definition, classification, technical requirements, test method, inspection rule and sign the packing and shipping storage requirements. This standard applies to the LED display products. It is the LED display product design, manufacture, installation and use, quality inspection and formulate various technical standard and technical documents of the main technical basis. 2, the reference standard

The following standards contain provision which, through reference in this standard, constitute provisions of this standard. In standard at time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate use the following standard the latest version of possibility.

3.2 LED display panel LED through certain control mode, to display text, graphics, text, images, animation, market, etc. Various kinds of information and TV, video signal and the LED display screen devices array group.

3.3 display element put unit by circuit and installation structure to determine its display of and the composition of the smallest unit of the LED display.

3.4 fatal defect critICal of unqualified products use, maintenance, or in connection with the personnel may cause damage or unsafe conditions of unqualified products, or unit of an important characteristic of quality characteristics of serious is not in conformity with the provisions.

3.5 out of control points out - - control point luminous status and the control requirements of display state is not consistent with a discrete awarded LED basic luminous points.

3.6 false color LED display panel pseudo - color leds in LED screen different regional install different colors of the single color leds components of the LED display.

3.7 full-color LED display all - color leds panel by red, green, blue three colors LED parts and can mix a variety of colour of the LED display.

4, classification

The LED display but basis classification of the following conditions:

4.1 use environment:

The LED display by use of indoor environment is divided into LED display and outdoor LED display.

4.2 display colors:

The LED display according to display colors divided into the single color LED display (including false color LED display), double colors LED display and full color (three colors) LED display. According to the gray level and can be divided into 16 and 32, 64, 128, 256 level gray LED display, etc.

4.3 display performance:

The LED panel according to display performance is divided into text LED display, graphic LED display, computer video LED display, television video LED display and market LED display, etc. prices

The LED display generally includes securities, interest rates, futures and the USES of the LED display.

4.4 basic shine points:

The prices of the LED display, indoor the LED display according to adopt LED single-point diameter can be divided into Φ 3mm, Φ 375mm, Φ 5mm, Φ 8mm, and Φ 10mm etc screen, Outdoor LED display by using the pixel diameter can be divided into Φ 19mm, Φ 22mm and Φ mm26 etc LED display. Prices of the LED display in accordance with the digital pipe size can divide 2.0 cm (0.8 cm (a), 2.5 1.0 cm (a), 3.0 1.2 a), 4.6 CMM (1.8 a), 5.8 cm (2.3 7.6 cm (a), 3inch) LED display.